Combined floor-drain and back-pressure water trap



May 17, 1927. 1,629,457

' W. v. BULMAN COMBINED FLOOR DRAIN AND BACK PRESSUREWATEH TRAP FiledDec.14, 1925 Patented May v1'7, 1927.

UNITED STATES PATENT OFFICE.

WILLIAM V. BULMAN, OF PHILADELPHIA,PENNSYLVANIA.

COMBJINED FLOOR-DRAIN AND Application filed December This invention is anovel improvement in combined floor drain and back 'pressure traps, andthe principal object of the invention is to provide a simple andeliicient combined tloor drain and back pressure trap, in which accessto the interior thereof will be readily obtainable, and which will beinexpensive to manufacture, said combined drain and trap embodying..certain novel features as hereinafter set forth.

I will explain the vinvention with reference to the accompanying drawingwhich illustrates one practical embodiment ythereof to enable others toadopt and use the same, and will summarize in the claims the novelfeatures of construction, and the novel combinations of parts, for whichprotection is desired.

In said drawings:

Figure 1 is a longitudinal section through my novel combined drain andtrap.

Fig. 2 is a top plan view thereof, partly broken away to show part ofthe interior construction.

Fig. 3 is a transverse section on the line 3-3, Fig. 1. n

Fig. 4 is a detail view showing the double wall construction forreceiving the back pressure Hap valve plate.

As shown in the drawing, the combined floor drain and back pressure trappreferably comprises a casting having a vertically disposed main bodyportion 1 of preferably substantially circular cross section, and of Vsuitable diameter, the lower portion l of body 1 contracting smoothlyinto a vertically disposed cylindrical neck portion 1b, of sub-kstantially half the normal diameter of body 1, the vertical axis of neck1b being olf-set from the vertical axis of the body portion 1. as shownin Fig. 1, so that the periphery of the front portion of neck 1b is acontinuation of or is tangent to the adjacent front portion of body 1.

The lower endy of neck 1b terminates into an upwardly directed tubularportion 1, the outer end 1d of portion 1c being disposed substantiallyhorizontal, with the bottom of portion 1d disposed at about the samelevel as the top of neck portion 1b, whereby water or other liquidpassing into the upper end of body portion 1 will be constantly retainedin the neck 1b and upwardly directed portion 1. Endl 11 may be attachedin the usual manner to a soil pipe (not BACK-PRESSURE WATER TRAP.

14, 1925. Serial No. 75,309.

usual grating 2 of any desired type, whereby when the body 1 is embeddedin the floor, grating 2 will be flush with the surface of said floor.Grating 2 is preferably retained in place upon shoulder 1f by means ofscrews or the like, so as to be readily removable.

Above the neck 1b, within the body 1, is an interior semi-annular flange1g, the plane of which flange'lg preferably slopes downwardly andrearwardly as shown in Fig'. 1, said flange extending from the front ofbody 1 rearwardly on both sides thereof to points somewhat beyond theinner edge of neck 1, the two ends of flange 1g terminating at each sideof body 1, into two spaced parallel walls 1h, 1k, which walls arepreferably integrall with flange 1g and body 1, and as shown in Fig. 3the walls 111,1k are preferably semi-circular, but are cut away, attheir centers, as at 1m for the reception of the iiap valve plate 3inserted between the walls 1h, 1k.

As shown, the parallel walls 1h, 1K, are disposed below andsubstantially at right angles to the plane of flange 1g, whereby saidwalls have an upward and rearward inclination, the wall 1k beingksubstantially tangent to the upper inner edge of neck l1.

Flap valve plate 3 is adapted to be inserted between the walls 1h. 1k,and when so placed, molten lead or the like may be poured between thewalls 1h, 1k, filling in around the edges 0f plate @,Iwhereby a tightpermanent connection will be made between the walls 1, 1k, and plate 3.

Plate 3 is provided with a top fiange 3a disposed in t-he plane offlange 1g and forming a continuation of the flange 1g and connecting theends of said flange 1g across the body 1. Furthermore plate 3 isprovided with a central opening 3b, having an annular shoulder 3, thelower edge of shoulder 3c being disposed adjacent the upper edgeV ofneck 1" so that the liquid entering the top of body 1 may passdownwardly into the neck 1b, through the opening 3b. A flap valve 3dnormally closes opening 3b, said valve being hinged, as at 3", at itsupper end, whereby the inclination of plate 3 will cause valve 3 to benormally closed by gravity, preventing` gas or liquid from passing'upwardly' from neck l1J into body l past valve 3d, but permitting liquidto readily pass 'from body l to neck lb.

A frame or pate 4i normally seats upon flanges lg and 3a, said platebeing' approximately circular' in shage, and provided with a gasket Vi-1 o-n its lower side adjacent the periphery thereof'. to make a tightconnection between the plate i and flanges ls' and 23, plate abeingpreferably screwed down upon flange lg as shown. an opening 4 isprovided' in the approximate center of the plate, into which is threadeda removable plug 4d. As shown in Fig. l, when plugV 4L is removed, theflap 3 maybe raised through opening' i-C. whereby access may be readilyhad to the interior of' body l.

My invention provides a simple, accessible, inexpensive, and efficientcombined fioor drain and back pressure trap. l do not, however` limit myinvention to the exact form shown in the drawing, for obviously minorchanges may be made in the details of construction withink the scope ofthe claims.

I ciaim:

l. A combined drain and trap, con'iprisinir4 a body portion having'anopen upper end; a trap extending- 'from the lower end of said body, theinlett'o-said trap being offset from the vertical axis of the body; aHarige in said body over the tra-p inlet a transversely disposedpartition in the said body connecting with the ends of the flange, theupper edge of the partition lying; in the plane of' the face of saidflange; said partition having,- a slot. and theedges ofvsaid slotbeing;` `grooved; a valve plate in said slot having its edges packedinto 'the grooves, the upper edge of the valve plate forming acontinuation of the upper edge of the partition; and a cover removablyseated on the flange, partition, and plate.

2. i combined drain and trap, comprisineV a body having,` an open upperend; a trap extending` from the lower end of said body, the inlet tosaid trap being` offset from the vertical aXis of thc body; a perforatedclosure for the upper end of the body; an inclined fiange in said bodyover the trap inlet; av transversely disposed partition in the said bodyconnecting' with the,Y ends of the flange, the upper edge of thepartition lying in the plane of the upper face of said flange, saidpartition having-v a slot open at the top, and a Agroove in the et geoit said slot; a valve plate in said slot having its edges packed intothe groove; the upper edge of the plate 'forming` a vcontinuation of theupper edge ofthe partition; Va valve in said plate opening towards thetrap inlet; and a cover detachably mounted on the flange and the upperend ofthe partition and plate.

In testimony thatY I claim the foregoing as my own I aiiiX my signature.

VVLLIAM V. BULMN.

